Jetting valve with two stage calibrating structures

Abstract

A jetting valve with two stage calibrating structures is disclosed, the jetting valve includes: a casing having an accommodating space; a piezoelectric actuating unit disposed on one side of the accommodating space; a spraying unit disposed on the other side of the accommodating space; a displacement amplifying element is arranged at the bottom of the accommodating space and leans against on the spraying unit, the bottom end of the piezoelectric driving unit is in contact with the displacement amplifying element; a sensing unit is arranged on the periphery of the displacement amplifying element to sense the movement of the spraying unit; a control unit, connected to the sensing unit and the piezoelectric actuating unit, adjusting the voltage supplied to the piezoelectric driving unit according to data obtained by the sensing unit; and a liquid supply unit connected to the spraying unit. In accordance with the present invention, a dispenser may be corrected its starting position for dispensing by large-range and small-range correction, and achieve the effect of rapid and accurate spraying calibration.

What is claimed is: 
     
       1. A jetting valve with two stage calibrating structures, comprising:
 a casing having an accommodating space, and forming an upper opening and a bottom opening; 
 a piezoelectric actuating unit including an actuator, wherein the actuator is disposed within the accommodating space along an axis of the upper opening, so that the actuator can move up and down in the accommodating space; 
 a spraying unit connected with the bottom opening on a bottom side of the casing; 
 a displacement amplifier configured to magnify movement of the actuator, wherein the displacement amplifier is arranged at a bottom of the accommodating space, one side of the displacement amplifier leans against the spraying unit, the displacement amplifier contacted with a bottom end of the actuator; 
 a sensing unit including a light emitter and a light receiver configured to sense a movement of the spraying unit, wherein the sensing unit is arranged within the accommodating space and on a periphery of the displacement amplifier; 
 a controller, connected to the sensing unit and the piezoelectric actuating unit, adjusting the voltage applied to the piezoelectric actuating unit according to data obtained by the sensing unit; and 
 a fluid material supply unit having a screw nut and connected to the spraying unit. 
 
     
     
       2. The jetting valve with two stage calibrating structures as claimed in  claim 1 , wherein the spraying unit comprising:
 a spring; 
 a thimble including a top surface, the top surface of the thimble is contacted to a convex surface at one side of the displacement amplifier by an elastic force of the spring; 
 a nozzle, having a glue outlet for dispensing a fluid material, and 
 an adjusting nut for adjusting the spraying unit to a starting position of the nozzle for jetting. 
 
     
     
       3. The jetting valve with two stage calibrating structures as claimed in  claim 2 , wherein the adjusting nut is a detachable module. 
     
     
       4. The jetting valve with two stage calibrating structures as claimed in  claim 3 , wherein the adjusting nut is configured to be adjusted automatically or manually to correct the starting position of the nozzle for jetting. 
     
     
       5. The jetting valve with two stage calibrating structures as claimed in  claim 3 , wherein the piezoelectric actuating unit is configured to be adjusted automatically or manually to correct the starting position of the nozzle for jetting. 
     
     
       6. The jetting valve with two stage calibrating structures as claimed in  claim 2 , wherein the controller is configured to adjust an open and close speed of the glue outlet to achieve an optimal dispensing status for fluid material. 
     
     
       7. The jetting valve with two stage calibrating structures as claimed in  claim 1 , wherein the data sensed by the sensing unit includes a velocity or a displacement of the nozzle. 
     
     
       8. The jetting valve with two stage calibrating structures as claimed in  claim 2 , wherein the nozzle is provided with modularization.